JPS5975691A - Method of mounting electric part on printed board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching electrical components to a printed circuit board, and more specifically, to a method for attaching electrical components to a printed circuit board, and more specifically, to a method for mounting electrical components on a printed circuit board. 1 to several methods of attaching electrical components to a board.

Recently, as the density of semiconductor components has increased, other electrical components have also become thinner and smaller, and there is an increasing need to make sets that incorporate various electrical components thinner, smaller, and lighter. It's coming.

By the way, the terminals of the electrical component can be fixed by inserting the terminal of the conventional electrical component into the mounting hole of the printed circuit board, placing the bottom of the electrical component on the surface of the printed circuit board, and dipping the back surface of the printed circuit board into a solder bath. The first method of attaching electrical components to a printed circuit board is that the electrical components can be attached to the printed circuit board by soldering.If the electrical components themselves are not made thinner and smaller, the set will eventually become thinner and smaller. It was quite difficult.

This is because there are switches, volume controls, etc. as electrical components that can be removed from the printed circuit board, and the lever switch 1, slide switch 2, and slide volume 3 shown in Figures 1 to 3 all have a thickness of Although it is thinner, the height is still the same as before. Therefore, for example, if the lever switch 1 is mounted on a printed circuit board 4 as shown in FIG. Dimensions that include the height of the lever/r edge 1.The bulk and height dimensions do not become smaller, and the set that incorporates the printed circuit board 4 that incorporates the lever switch is made thinner and more compact. Because it cannot be done.

In addition, although not shown in the figure, the terminals of electrical components such as a bushing switch, which are thinner in thickness but not much different in height from conventional ones, are bent at right angles in advance, and the bent terminals are then placed on the printed circuit board or printed circuit board. Place the side of the bushing switch on the outside of the side of the printed board so that the bushing switch is in the tilted state when inserted into the mounting hole on the side of the board.
When the terminals of the bushing switch are soldered by dipping the back side of the printed circuit board in a solder bath, the bushing switch can be attached to the printed circuit board. The bulk and height of the printed circuit board is reduced, and the sensor 1 can be made thinner and smaller. However, in this case, the operating button of the bushing switch is large, and if the bushing switch is knocked down and a part of the operating button protrudes to the back side of the printed circuit board, it must be dipped in a solder bath and connected to other electrical components. It was not possible to solder at the same time, and on the other hand, if you wanted to solder, you had to turn the operation button back on.

Furthermore, as shown in the figure, the terminals 1a, 2a, and 3a of the lever switch 1, slide switch 2, and slide volume 3 are all shaped like rods with a rectangular cross section, and this can also be said of all terminals of electrical components. For example, if the lever switch 1 is attached to the printed circuit board 4 as shown in Fig. 4, the terminal 1 of the lever switch 1
Since there are no obstacles in the way of terminal 1a, and the distance from the soldering part to the bottom of lever switch 1 is short, there is a risk that flux may infiltrate into lever switch 1 through terminal 1a. Therefore, lever switch 1
There was a problem in that it caused malfunction.

The method of the present invention was developed by focusing on such conventional problems, and involves forming a locking step in the middle of the terminal of an electrical component having a protruding terminal, and connecting the locking step and the base of the terminal. A narrow bent part is formed between the terminals of the electrical component, and the terminal of the electrical component is inserted into the mounting hole of the printed circuit board, and is locked at the locking step to position the electrical component by a predetermined distance above the printed circuit board. Place the electrical component on the printed circuit board in a flat position, and after fixing the terminals of the electrical components to the printed circuit board by soldering, bend the terminals from the bent parts and place the electrical components on the printed circuit board in a laid-down state. This aims to solve the above problems.

1: The method of this invention will be explained based on the drawings.

5 to 11 are diagrams showing an embodiment of the method of this invention.

First, the electrical components used in the method of this invention will be explained.

Figures 5 to 8 show specific examples of electrical parts used in the method of this invention. Figure 5 shows the lever switch 10, Figure 6 shows the slide switch 11, Figure 7 shows the slide volume 12, and Figure 7 shows the lever switch 10. FIG. 8 shows the bushing switch 13, respectively. The terminals of these switches and volumes 10 to 13 are all formed in the same shape, and FIG. 9(a) shows the configuration of the terminals 15 of these switches and volumes 10 to 13.

The terminal 15 shown in FIG. 9(a) has a locking stepped portion 15b extending in the width direction from both sides of the terminal body 15a in the middle of a terminal body 15a formed in a bar shape with a rectangular cross section. A wide portion 15c extending from both sides of the terminal body 15a similar to the locking step portion 15b is formed at the base of the terminal body 15a,
Locking step portion 15b and tlJ wide portion 1 in terminal body 15a
5c, a semicircular cut is made to form a narrow bent portion 15d.

The terminal 15' shown in FIG. 9(b) is a first modification of the terminal 15 shown in FIG. 9(a), and has a bent portion 15' of the terminal 15'.
The only difference is that the shape of d is different from the bent portion 15d of the terminal]5, and the bent portion 15'd is a locking step in the terminal main body 15'a]5
A triangular notch tL is formed between the wide portion 15'C and the wide portion 15'C.

The terminal 15" shown in FIG. 9(c) is a second modification of the terminal 15 shown in FIG. A locking step 15''b is formed extending in the rlJ direction from both sides of the terminal body 15''a, and a terminal is formed between the locking step 15''b of the terminal body 15''a and the base of the terminal body 1.5''a. It is constructed by forming a narrow bent portion 15''d consisting of a part of the main body 1.5''a.

Next, FIGS. 10(a) to (C) and 11 show how to attach electrical components to a printed circuit board using the method of this invention.
This will be explained based on FIGS. (a) to (C).

In this embodiment, a bush switch 13 shown in FIG. 8 is used as an electrical component. This bush switch 1
3 has three terminals 15, and the bushing switch 1
Printed circuit board locking portions 13a are provided on both sides of 3, respectively.

On the other hand, a notch 21 into which the bushing switch 13 fits is formed on the side of the printer 1 to the board 20.

A bushing switch 13 is located near the bottom of the notch 21.
There are three holes 22 into which the three terminals 15 are inserted.

To attach the bushing switch 13 to the printed circuit board 20, first, as shown in FIG. 10(a) and FIG. Insert it into each of the three mounting holes 22 provided. And FIG. 10(b) and FIG. 11(b)
As shown in the figure, the locking steps 15b of each terminal 15 are brought into contact with the surface of the printed circuit board 20, and the bushing switch 13 is positioned above the printed circuit board 1 by a predetermined distance from the printed circuit board 20. ”-.

Thereafter, the terminal 15 of the bush switch 13, that is, the terminal body protruding from the back surface of the printed circuit board 20, is removed by dipping the back surface of the printed circuit board Fj, 20 on which the bush switch 13 is placed into a hunter tank (not shown). Solder the tip of 15a and fix it.

During this half-J'' inspection, the flux tries to penetrate through the terminal 15 and into the bushing switch 13 from the base of the terminal 15, but the flux is disposed in the middle of the terminal 15 and does not reach the surface of the printed circuit board 20. The distance from the part to be soldered to the bottom of the bushing switch 13 is between the wide part 15c provided at the base of the terminal 15 and the locking step 15b. Bend part 1 at 11th stroke
5d is provided and is long, so that it is difficult for flux to penetrate into the bush switch 13.

After attaching the bushing switch 13 to the print board 1 to the board 20 by attaching it for half a day as shown in Figure 10 (c).
) and as shown in FIG. 11(C), the terminal 15 is bent at a right angle at the bent part 15d with a narrow neck to form the bushing switch 1.
3 is cut into the pudding 14 temporary 20 to make it lie down, and the printed board locking parts 13a provided on both sides of the bush switch 13 are pushed into the top part 21 formed on the pudding 1 and the board 20 to cut out the notch. opposing side edges 2 of the portion 21],
engage with a.

In this way, when the bushing switch 13 is set in the collapsed state toward the print 1 to board 2 degrees (-1 injury is reached).

By placing the bushing switch 13 in the laid-down state in this manner, the bulk and height of the printed circuit board 20 to which the bushing switch 13 is attached can be determined by the thickness dimension of the bushing switch 13 and the thickness dimension of the printed circuit board 2o. If the outer diameter of the operating shaft 16 attached to the bushing switch 13 is larger than the thickness, the outer diameter of the operating shaft 16 will be the combined dimension. Further, as in this embodiment, the bush switch 13 is connected to the printed circuit board 2.
When placed in the notch 21 of 0, the bulk height of the printed circuit board 20 becomes the same dimension Q as the thickness dimension of the operating shaft, as shown in FIG. 11(c).

Since the bushing switch 13 is configured to have a small thickness, its bulk becomes small, and the set including the printed circuit board 20 to which the bushing switch 13 is attached can be made thinner and smaller. It has become possible.

In addition, after the bushing switch 13 is placed on the side of the printed circuit board vi20, the terminal 15 is bent and the bushing switch 13 is laid down.
The operating button 16 is large, and the button switches 1 and 3 are placed in the notch 21 of the printed circuit board 20 with the buttons 1 and 3 in the lower position, so that a part of the operating shaft 16 protrudes from the back side of the printed circuit board 20. Even if there is no problem 1, operation button 16
Since there is no need to retrofit the button to the button switch 13, the size and shape of the operation button 16 can be freely selected, and it can be dipped at the same time as other electrical components (not shown or not) attached to the printed circuit board Fi2o. I can do it.

Furthermore, in this embodiment, the bush switch 1 is
The printed circuit board locking portion 13a of No. 3 is on the side iJ< of the notch 21
21. a, and the bushing switch 13 is held on the printer 1-board 20 in a laid down state.
Once installed, you can install the bushing switch 13 firmly.

In this embodiment, the installation of a bush switch as an electrical component has been described, but it is possible to install not only a bush switch but also other electrical parts; as described above, according to the method of this invention, the structure A locking step is formed in the middle of the terminal of an electrical component having a protruding terminal, and a narrow-necked bent portion is formed between the locking step and the terminal,
Place the terminal of the electrical component on the printed circuit board (=insert it into the J hole, lock it with the locking step, and remove the electrical component from the printed circuit board). Since the terminals of the electrical components are fixed to the printer 1 to the board by soldering, there is an obstacle called a locking step in the middle of the terminals of the electrical components, and furthermore, the terminals of the electrical components are soldered. Since the distance from the part to the bottom of the electrical component is longer with the bend, soldering can sometimes have the effect of making it difficult for flux to penetrate into the electrical component.

In addition, since the terminals of the electrical components are fixed to the printed circuit board, the terminals are bent from the bent portions, and the electrical components are attached to the printer 1 to the circuit board in a laid-down state, so that the thickness dimension is small. When using electrical components, the bulk and height of the electrical components that are laid down become smaller, making it possible to make the set that incorporates the printed circuit board on which such electrical components are attached thinner and smaller. The effect is obtained. Therefore, there is no need to reduce the size of the electrical components themselves.

Furthermore, since the electrical components are arranged in a laid down position in the notch of the printer 1 board, when attaching the large operation button tx (i) to the printer 1 board, the operating shaft must be attached to the electrical component first. This has the advantage that other electrical components can be dipped at the same time when soldering.

[Brief explanation of drawings]

Figures 1 to 3 show specific examples of electrical components used in the conventional method for attaching electrical components to a printed circuit board. Figure 1 is a perspective view of a lever switch, and Figure 2 is a perspective view of a slide switch. Figure 3 is a perspective view of the slide polygon L-1, and Figure 4 is a partial cross-section showing a state in which a lever switch is attached to the printed circuit board by the method of attaching electrical components to the same printed circuit board. 5 to 8 show specific examples of electrical components used in the method of attaching electrical components to a printed circuit board, which is an embodiment of the present invention. FIG. 5 is a perspective view of a lever switch, and FIG. The figure is a perspective view of the slide switch, Figure 7 is a perspective view of the slide volume, Figure 8 is a perspective view of the bushing switch, Figure 9 is (a) to Cc, and 'J is the connection of electrical components to the same printed circuit board. An explanatory diagram showing different configurations of terminals of electrical components used in the mounting method, FIG.
) to (C) are perspective views showing the steps of the method for attaching electrical components to the same printed circuit board, and FIG. It is. 13... Bush switch (electrical parts), 15.15
' , 15"...Terminal, 15b, 15' b, 15"
b=-locking step, 15c. 15' c-wide part (base), 15d, 15' d, 1
5″d-...Bending portion, 20...Printed circuit board, 21...
...Notch. Applicant: Alps Electric Co., Ltd. Agent: Patent Attorney Tami Nishiwaki, WEi Figure 5 Figure 7

Claims (2)

[Claims] (1) A locking step is formed in the middle of the terminal of the electrical component having the protruding end t, and a sharply bent portion is formed between the locking step and the base of the terminal. , the terminal of the electrical component is inserted into the mounting hole of the printed circuit board 1 and the printed circuit board is locked by the locking step, and the electrical component is positioned above the printed circuit board 1 by a predetermined distance. Place the electrical component on the board, attach the terminals 21' and +11 of the electrical component to the printed circuit board 1, 1, 2, 1, and then bend the terminal from the bent part to form the 1) iIWL electrical component. A N1 method for attaching electrical components to a print J, ji temporary, characterized in that the electrical parts are placed in a laid-down state onto the print J, ji board. (2) The method for attaching electrical components to a printed circuit board as described in item 1 of the patent δ〆r request, characterized in that the electrical components are arranged in a laid down state in the notch of the printed circuit board. Law.